| 초록 |
For decades, hydrogen gas has been considered the most renewable and sustainable energy source which can be alternative of fossil fuel, owing to its environmentally friendly and perfect combustion without carbon included emissions. Despite of these advantage, it is required to ensure safety regarding the use of hydrogen gas due to its colorless, odorless properties and especially its explosive behavior in wide range of concentration (from 4% to 75%) in ambient air. Therefore, most of researcher efforts have been focused on the development of hydrogen gas sensor with high sensitivity and fast response time to prevent unexpected risks. Among various hydrogen gas sensor devices, thermoelectric based hydrogen gas sensors have shown a great potential as a next generation of hydrogen gas sensor, owing to low power consumption, fast response time and room temperature operability. The thermoelectric hydrogen gas sensor device is composed of a thermoelectric layer that generates voltage due to temperature difference from exothermic reaction of hydrogen oxidation by catalyst. In this research, we have developed thermoelectric hydrogen gas sensor based on tellurium nanowires and graphene supported Pt nano-sized catalyst. The tellurium nanowires was synthesized by solvothermal method and the thermoelectric layer fabricated by tape casting method using tellurium nanowire paste. The device showed great sensing performance due to the high Seebeck coefficient of tellurium at room temperature. The device can detect with a wide range of H2 concentrations and which was showed relatively fast response and recovery time at room temperature. |
